Obj-C：它在旋转前改变中心

It's my code:

这是我的代码:

[UIView animateWithDuration:0.4f
                      delay:0.1f
                    options:UIViewAnimationOptionCurveEaseOut
                 animations:^{
                     CGAffineTransform rotate = CGAffineTransformMakeRotation( 30.0 / 180.0 * 3.14 );
                     [needleBig setTransform:rotate];

                 }
                 completion:^(BOOL finished){


                 }];
[UIView animateWithD